Limbic and cortical control of phonation for speech in response to a public speech preparation stressor
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ORIGINAL RESEARCH
Limbic and cortical control of phonation for speech in response to a public speech preparation stressor Maria Dietrich 1
&
Richard D. Andreatta 2 & Yang Jiang 3 & Joseph C. Stemple 2
# The Author(s) 2019
Abstract Knowledge on brain networks subserving vocalization in vocally healthy individuals under various task conditions is scarce but paramount to understand voice disorders. The aims of our study were to determine (1) the effect of social-evaluative stress on the central neural control of phonation underlying speech production; and (2) the neural signature, personality profile, and aerodynamic vocal function in relation to salivary cortisol responses. Thirteen vocally healthy females underwent an event-related sparse-sampling fMRI protocol consisting of voiced and whispered sentence productions with and without exposure to the social-evaluative stressor public speaking anticipation. Participants completed a personality questionnaire, rating scales of negative emotional state, and provided salivary cortisol samples. In the total sample, the task contrast of voiced productions revealed that stressor exposure resulted in a peak activation in the right caudate with concomitant deactivations in the bilateral pgACC and aMCC, and right IFG, BA 9, BA 10, insula, putamen, and thalamus. There were individual differences in stressor-induced brain activations as a function of stress reactivity with greater cortisol reactivity linked with lower laryngeal motor cortex activity and lower scores on aspects of extraversion. Our data confirm that stress alters the phonatory control for speech production through limbic-motor interactions. The findings support the Trait Theory of Voice Disorders (Roy and Bless 2000) and help provide critical insights to the study of voice disorders such as primary muscle tension dysphonia. Keywords Functional MRI . Limbic . Stress . Larynx . Voice disorders . Muscle tension dysphonia
Introduction * Maria Dietrich [email protected] Richard D. Andreatta [email protected] Yang Jiang [email protected] Joseph C. Stemple [email protected] 1
Department of Speech, Language and Hearing Sciences, University of Missouri, 308 Lewis Hall, Columbia, MO 65211, USA
2
Department of Communication Sciences and Disorders, University of Kentucky, 120 Wethington Bldg, 900 S. Limestone, Lexington, KY 40536, USA
3
Department of Behavioral Science, University of Kentucky, 113 Medical Behavioral Science Building, Lexington, KY 40536, USA
Phonatory control for speech operates under fluctuating cognitive and emotional states. While humans exert volitional control over phonation underlying speech production via primarily direct corticomotoneuronal pathways (Jürgens 2002), the direct or indirect impact of emotion on phonation for speech remains ambiguous at best. Primary vocal motor areas include the laryngeal motor cortex (LMC), premotor cortex, supplementary motor area (SMA), and lobule VI of the cerebellum, whereas secondary areas include the cingulate motor area, the ventr
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